CN104578450A - Wireless power transmission apparatus and wireless power transfer system - Google Patents

Wireless power transmission apparatus and wireless power transfer system Download PDF

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Publication number
CN104578450A
CN104578450A CN201410587664.2A CN201410587664A CN104578450A CN 104578450 A CN104578450 A CN 104578450A CN 201410587664 A CN201410587664 A CN 201410587664A CN 104578450 A CN104578450 A CN 104578450A
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China
Prior art keywords
mentioned
voltage
power transmission
receiving device
frequency
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CN201410587664.2A
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Chinese (zh)
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CN104578450B (en
Inventor
菅野浩
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to CN201611003520.3A priority Critical patent/CN106505750B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
    • H02J7/025—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H02J5/005—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H02J50/23—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices

Abstract

A wireless power transmission apparatus disclosed includes a power transmission antenna, receiver circuits, and a control circuit, wherein the power transmission antenna transmits high-frequency power at each of frequencies to wireless power reception apparatuses, each of the receiver circuits obtains, from a corresponding one of the wireless power reception apparatuses, the value of a required voltage of the wireless power reception apparatus and the value of a power reception voltage received by the wireless power reception apparatus from the wireless power transmission apparatus; and the control circuit obtains the required voltage value and the power reception voltage value from each of the receiver circuits, and controls the frequency of the high-frequency power. The control circuit changes the frequency of the high-frequency power so that the sum total of errors between the required voltage and the power reception voltage is minimized.

Description

Wireless power transmission device and Wireless power transmission system
Technical field
The disclosure relates to the wireless power transmission device and the Wireless power transmission system that are sent electric power by the electromagnetic induction between power transmission coil and electricity reception coil in a non contact fashion.
Background technology
In recent years, be that the various mobile devices of representative are day by day universal with portable telephone.The consumes power of mobile device continues to increase due to function and the raising of performance and the variation of content.In the mobile device worked utilizing the battery of predetermined volumes, when its consumes power increases, the operating time of this mobile device shortens.As the technology of the finite capacity for balancing battery, Wireless power transmission system receives publicity.Wireless power transmission system, by the electromagnetic induction between the power transmission coil and the electricity reception coil of wireless receiving device of wireless power transmission device, sends electric power from wireless power transmission device to wireless receiving device in a non contact fashion.Especially, have employed the power transmission coil of mode of resonance and electricity reception coil (oscillating magnetic field coupling) though Wireless power transmission system also can maintain high-transmission efficiency when staggering mutually in the position of power transmission coil and electricity reception coil, therefore can expect the application in various field.
Such as, the Wireless power transmission system of known patent document 1 ~ 4.According to the Wireless power transmission system of patent documentation 1 ~ 4, the high frequency magnetic field that the space via the periphery at coil produces makes 2 coil couplings, thus via the space between coil with noncontact (wireless) mode transferring electric power.
Prior art document
Patent documentation 1: Japanese Unexamined Patent Publication 2010-016985 publication
Patent documentation 2: International Publication No. 2012/081519 handbook
Patent documentation 3: International Publication No. 2012/164744 handbook
Patent documentation 4: Japanese Unexamined Patent Publication 2013-034367 publication
Summary of the invention
But, in the prior art, suitable power supply cannot be carried out from a wireless power transmission device to multiple wireless receiving device in a non contact fashion simultaneously.
Object of the present disclosure is, provides a kind of wireless power transmission device and Wireless power transmission system, can carry out suitable power supply in a non contact fashion from 1 wireless power transmission device to multiple wireless receiving device simultaneously.
The wireless power transmission device of mode of the present disclosure possesses: power transmission antenna, sends each High frequency power corresponding with multiple frequency to multiple wireless receiving device; And control circuit, control receiving circuit, above-mentioned receiving circuit obtains the requirement voltage of each wireless receiving device value from each wireless receiving device of multiple wireless receiving device and the value of receiving voltage accepted from wireless power transmission device by each wireless receiving device.Above-mentioned control circuit makes the frequency change of the High frequency power from each wireless receiving device power transmission of above-mentioned power transmission sky alignment, minimizes with the summation of the error making the requirement voltage in each wireless receiving device and receiving voltage.
According to wireless power transmission device of the present disclosure, suitable power supply can be carried out from a wireless power transmission device to multiple wireless receiving device in a non contact fashion simultaneously.
Accompanying drawing explanation
Fig. 1 is the block diagram of the formation of the Wireless power transmission system representing the 1st execution mode.
Fig. 2 is the equivalent circuit figure representing the power transmission antenna 22-1 of Fig. 1 and the installation example of power receiving antenna 31-1.
Fig. 3 represents the power transmission antenna 22-1 of Fig. 1 and the power transmission antenna 22a-1 of the 1st variation of power receiving antenna 31-1 and the equivalent circuit figure of power receiving antenna 31a-1.
Fig. 4 represents the power transmission antenna 22-1 of Fig. 1 and the power transmission antenna 22b-1 of the 2nd variation of power receiving antenna 31-1 and the equivalent circuit figure of power receiving antenna 31b-1.
Fig. 5 represents the power transmission antenna 22-1 of Fig. 1 and the power transmission antenna 22c-1 of the 3rd variation of power receiving antenna 31-1 and the equivalent circuit figure of power receiving antenna 31c-1.
Fig. 6 is the flow chart representing the power transmission control treatment performed by the control circuit 24 of the wireless power transmission device 2 of Fig. 1.
Fig. 7 is the block diagram of the formation of the Wireless power transmission system of the variation representing the 1st execution mode.
Fig. 8 is the block diagram of the formation of the Wireless power transmission system representing the 2nd execution mode.
Fig. 9 is the block diagram of the formation of the Wireless power transmission system of the variation representing the 2nd execution mode.
Figure 10 is the circuit diagram of the detailed formation of the oscillating circuit 21C representing Fig. 9.
Figure 11 is the flow chart representing the power transmission control treatment performed by the control circuit 24B of the wireless power transmission device 2B of Fig. 8.
Figure 12 is the block diagram of the formation of the Wireless power transmission system representing the 3rd execution mode.
Figure 13 is the equivalent circuit figure representing the power transmission antenna 22D-1 of Figure 12 and the installation example of power receiving antenna 31D-1.
Figure 14 is the circuit diagram of the installation example of the capacitor C1 representing Figure 13.
Figure 15 is the figure representing receiving voltage V1, the V2 of embodiment 1, the frequency characteristic of global error index E s.
Figure 16 is the figure (when the input voltage of oscillating circuit 21 is 10V) representing receiving voltage V1, the V2 of embodiment 2, the frequency characteristic of global error index E s.
Figure 17 is the figure (when the input voltage of oscillating circuit 21 is 6.94V) representing receiving voltage V1, the V2 of embodiment 2, the frequency characteristic of global error index E s.
Figure 18 is the figure of the frequency characteristic of the global error index E s representing embodiment 3.
Embodiment
< becomes the opinion > on the basis of invention
The Wireless power transmission system that the present inventor is described in hurdle to " background technology ", has found following problem.
Patent documentation 1 to 3 disclose only 1 the wireless power transmission device with power transmission coil to the common Wireless power transmission system of a wireless receiving device transferring electric power with electricity reception coil.
On the other hand, in patent documentation 4, disclose 1 wireless power transmission device and there is power transmission coil, and from this power transmission coil to multiple wireless receiving device, carry out the contactless power supply device of powering in a non contact fashion simultaneously.The method of above-mentioned patent documentation 4 be based on the electric power supplied to multiple wireless receiving device from above-mentioned power transmission coil and the method for the frequency that decides above-mentioned power transmission coil.At this, also the frequency of above-mentioned power transmission coil can be renamed as the driving frequency of power transmission side circuit later.
In general, assuming that different wireless receiving devices has different load characteristics, different electric power is required.And then, assuming that carry out action respectively in different input voltage ranges from the different load that different wireless receiving devices connects.Such as, wireless receiving device is the mobile device possessing rechargeable battery (secondary cell), when being used with the object of charging to this rechargeable battery by wireless power transmission device, needs the control carrying out meticulous charging voltage according to different loads.But, based on the electric power supplied to multiple wireless receiving device from above-mentioned power transmission coil and when deciding the driving frequency of power transmission side circuit, individually cannot control the electric power sent to multiple wireless receiving device.
Therefore, when supplying electric power from above-mentioned power transmission coil to multiple wireless receiving device, such as, the maximized mode of summation also considering the electric power that multiple wireless receiving device is accepted determines the driving frequency of the power transmission side circuit of wireless power transmission device simultaneously.But, in some wireless receiving devices, the requirement voltage that can require at above-mentioned wireless receiving device and an above-mentioned wireless receiving device accept electric power and produce poor (error) between the voltage exported to load, and the voltage that exports to the above-mentioned load situation significantly beyond above-mentioned requirements voltage particularly can occur.In an above-mentioned wireless receiving device, the exceeding of voltage exported to above-mentioned load can hinder safe charging action, also can cause the destruction of the circuit element forming an above-mentioned wireless receiving device.In addition, as other states, the voltage that can occur to export to above-mentioned load does not reach the situation of above-mentioned requirements voltage., there is the problem being difficult to realize stable charging action, power supply action in its result.Also the voltage exported to above-mentioned load can be renamed as output voltage later.
The reason of the problems referred to above is thought of as follows.
Such as, when determining the driving frequency of power transmission side circuit in the maximized mode of summation of the electric power making multiple wireless receiving device accept, the electric power supplied to each wireless receiving device meets the requirement electric power of each wireless receiving device.But, even if in this case, because the voltage of the electric power of the resonance frequency of above-mentioned each wireless receiving device multiple, requirement, requirement, the load connecting electricity reception coil or coupling coefficient between power transmission coil with electricity reception coil may not be consistent, so in some wireless power transmission devices, likely produce the error requiring voltage and output voltage.
Like this, in above-mentioned example, determine that the driving frequency that the summation of electric power that multiple wireless receiving device is accepted maximizes such power transmission side circuit not yet realizes carrying out suitable charging and action of powering to multiple wireless receiving device.
That is, the error requiring voltage and receiving voltage in each wireless receiving device of the above-mentioned multiple wireless receiving device of minimizing is not yet considered.
That is, above-mentioned patent documentation 1 is in above-mentioned patent documentation 4, does not all consider the error reducing as far as possible to require voltage and receiving voltage in multiple wireless receiving device.Therefore, even if determine the driving frequency of power transmission side circuit in the maximized mode of summation of the electric power making multiple wireless receiving device accept, the receiving voltage of each wireless receiving device also cannot meet target voltage ranges sometimes.At this, target voltage ranges refers to centered by the requirement voltage of wireless receiving device, the scope of the voltage of being allowed by wireless receiving device.
Thus, in wireless power transmission device, when supplying electric power from a wireless power transmission device to multiple wireless receiving device simultaneously, expect to carry out controlling to make the receiving voltage of each wireless receiving device meet target voltage ranges.And, in wireless power transmission device, to expect from a wireless power transmission device, to multiple wireless receiving device, to carry out suitable power supply in a non contact fashion simultaneously.
By above investigation, the present inventors contemplate each mode of following invention.
The wireless power transmission device of a mode of the present disclosure,
Be the wireless power transmission device of the Wireless power transmission system sending High frequency power to multiple wireless receiving device, possess:
Power transmission antenna, to each wireless receiving device of above-mentioned multiple wireless receiving device, sends each High frequency power corresponding with multiple frequency;
Multiple receiving circuit, from each wireless receiving device of above-mentioned multiple each wireless receiving device, obtain the value of the value of the requirement voltage of each wireless receiving device above-mentioned and the receiving voltage of above-mentioned each wireless receiving device corresponding with each frequency of above-mentioned multiple frequency; And
Control circuit, obtains the value of above-mentioned requirements voltage and the value of above-mentioned receiving voltage from above-mentioned multiple receiving circuit, controls the frequency of the High frequency power sent to each wireless receiving device of above-mentioned multiple wireless receiving device,
Above-mentioned control circuit,
The High frequency power corresponding with above-mentioned each frequency is sent to above-mentioned multiple wireless receiving device successively with each frequency in above-mentioned multiple frequency,
Relatively the 1st summation and the 2nd summation, above-mentioned 1st summation is the summation adding up to the above-mentioned requirements voltage of each wireless receiving device above-mentioned when sending the High frequency power corresponding with the 1st frequency in above-mentioned multiple frequency and the error of above-mentioned receiving voltage and obtain, above-mentioned 2nd summation is the summation adding up to the above-mentioned requirements voltage of each wireless receiving device above-mentioned when sending the High frequency power corresponding with the 2nd frequency in above-mentioned multiple frequency and the error of above-mentioned receiving voltage and obtain
Setting is close to the 3rd frequency of the frequency corresponding with the summation of an a certain less side in above-mentioned 1st summation and above-mentioned 2nd summation, and each wireless receiving device to above-mentioned multiple wireless receiving device sends the High frequency power corresponding with above-mentioned 3rd frequency,
For each wireless receiving device of above-mentioned multiple wireless receiving device, make above-mentioned control errors in predetermined benchmark.
According to aforesaid way, when supplying electric power from a wireless power transmission device to multiple wireless receiving device simultaneously, reduce the summation of the error of the receiving voltage received from wireless power transmission device in the requirement voltage of each wireless receiving device and above-mentioned each wireless receiving device.Adopt the frequency reducing above-mentioned error to each wireless receiving device transmission High frequency power of above-mentioned multiple wireless receiving device, receiving voltage can be controlled thus and meet target voltage ranges to make receiving voltage in each wireless receiving device of multiple wireless receiving device.Its result, can carry out suitable power supply from a wireless power transmission device to multiple wireless receiving device in a non contact fashion simultaneously.At this, 1 wireless power transmission device, for each wireless receiving device of above-mentioned multiple wireless receiving device, only possesses 1 oscillating circuit sending each High frequency power corresponding with multiple frequency to power transmission antenna.
In aforesaid way, such as, in more above-mentioned 1st summation of above-mentioned control circuit and above-mentioned 2nd summation a less side summation with send and the 3rd summation, the summation that the above-mentioned requirements voltage of each wireless receiving device above-mentioned when above-mentioned 3rd summation is the High frequency power to transmission is corresponding with above-mentioned 3rd frequency and the error of above-mentioned receiving voltage add up to and obtain, setting is close to the 4th frequency of the frequency corresponding with the summation of a less side in the summation and above-mentioned 3rd summation of an above-mentioned less side, each wireless receiving device to above-mentioned multiple wireless receiving device sends the High frequency power corresponding with above-mentioned 4th frequency,
Repeat the summation that above-mentioned process decides above-mentioned error and become minimum frequency, each wireless receiving device to above-mentioned multiple wireless receiving device sends and the summation of above-mentioned error becomes High frequency power corresponding to minimum frequency.
According to aforesaid way, repeatedly carry out determining to make the summation of above-mentioned error become the process of less frequency, thus, determine to make the summation of above-mentioned error become minimum frequency, therefore, it is possible to control receiving voltage, meet target voltage ranges to make the receiving voltage of each wireless receiving device.
In aforesaid way, such as, above-mentioned wireless power transmission device can also possess: voltage regulator circuit, makes the magnitude of voltage change from the voltage of supply unit input and exports to above-mentioned power transmission antenna,
Above-mentioned control circuit is after making the summation of above-mentioned error minimize, in at least one wireless receiving device in above-mentioned multiple wireless receiving device, when the error of above-mentioned requirements voltage and above-mentioned receiving voltage exceedes predetermined threshold value, magnitude of voltage from above-mentioned voltage regulator circuit to above-mentioned power transmission antenna that export from is reduced, makes the error of above-mentioned requirements voltage at least one wireless receiving device above-mentioned and above-mentioned receiving voltage below above-mentioned threshold value.
According to aforesaid way, after making the summation of above-mentioned error minimize, at least one sometimes in above-mentioned multiple wireless receiving device, the error of above-mentioned wireless receiving device can exceed predetermined threshold value.In this case, by reducing the output voltage of above-mentioned voltage regulator circuit, making above-mentioned error below above-mentioned threshold value, receiving voltage can be controlled and meet target voltage ranges to make the receiving voltage of each wireless receiving device.
In aforesaid way, such as, at least one party of the power receiving antenna of above-mentioned power transmission antenna and above-mentioned wireless receiving device comprises the circuit element with variable circuit constant,
Above-mentioned control circuit also can make the circuit constant of at least one party of above-mentioned power transmission antenna and above-mentioned power receiving antenna change.
Even if the power transmission of carrying out above-mentioned either type controls, all the receiving voltage of wireless receiving device also still cannot meet target voltage ranges sometimes.Thus, according to aforesaid way, the circuit constant of at least one party of above-mentioned power transmission antenna and above-mentioned power receiving antenna is changed, the frequency characteristic of the summation of above-mentioned error is changed.That is, the minimum value change of the summation of above-mentioned error.Its result, can control receiving voltage and meet target voltage ranges to make the receiving voltage of each wireless receiving device.
In aforesaid way, such as, the error of above-mentioned each wireless receiving device also can calculate based on the mean value of the receiving voltage of the mean value of the requirement voltage of the receiving voltage of the requirement voltage of this wireless receiving device, this wireless receiving device, above-mentioned multiple wireless receiving device and above-mentioned multiple wireless receiving device.
In aforesaid way, such as, above-mentioned wireless power transmission device also can possess the High frequency power that produces and have variable frequency and to the power transmission circuit of above-mentioned power transmission antenna supply, and above-mentioned power transmission circuit also can comprise and produces the power transformation circuit of variable output voltage from input voltage and produce the translation circuit of High frequency power of variable frequency from the output voltage of above-mentioned power transformation circuit.
In aforesaid way, such as, above-mentioned power transmission circuit also can comprise by making to carry out the phase place change of the switching signal of switch to multiple switch and produce the translation circuit with the High frequency power of variable output voltage.
In aforesaid way, such as, above-mentioned power transmission circuit also can comprise by carrying out switch motion with variable duty ratio and produce the translation circuit of the High frequency power with variable output voltage.
In addition, above-mentioned mode also can realize as the Wireless power transmission system with above-mentioned wireless power transmission device and above-mentioned multiple wireless receiving device.
In aforesaid way, such as, above-mentioned each wireless receiving device possesses: power receiving antenna, and it comprises the resonant circuit comprising electricity reception coil; And transtation mission circuit, the value sending the requirement voltage of above-mentioned wireless receiving device to above-mentioned wireless power transmission device and the value of receiving voltage received from above-mentioned wireless power transmission device by above-mentioned wireless receiving device.
In aforesaid way, such as, above-mentioned each wireless receiving device can also possess rechargeable battery, accepts the supply of High frequency power, charge to above-mentioned rechargeable battery from above-mentioned wireless power transmission device.
The wireless power transmission device of other modes of the present disclosure,
The wireless power transmission device of the Wireless power transmission system comprising a wireless power transmission device and multiple wireless receiving device,
Above-mentioned each wireless receiving device possesses power receiving antenna, and it possesses the resonant circuit comprising electricity reception coil,
Above-mentioned wireless power transmission device possesses:
At least one power transmission antenna, possesses the resonant circuit comprising power transmission coil, with the power receiving antenna electromagnetic coupled of above-mentioned each wireless receiving device;
Power transmission circuit, generation has the High frequency power of variable frequency and supplies to above-mentioned power transmission antenna;
Receiving circuit, the value obtaining the requirement voltage of this wireless receiving device from above-mentioned each wireless receiving device and the value of receiving voltage received from above-mentioned wireless power transmission device by this wireless receiving device; And
Control the control circuit of above-mentioned power transmission circuit,
Above-mentioned control circuit,
To above-mentioned each wireless receiving device, calculate the relative error index representing the requirement voltage of this wireless receiving device and the error of receiving voltage,
The global error index of above-mentioned multiple wireless receiving device is calculated according to the relative error index of above-mentioned each wireless receiving device,
Make the frequency change of the High frequency power produced by above-mentioned power transmission circuit, minimize to make above-mentioned global error index.
In aforesaid way, such as, the relative error index of above-mentioned each wireless receiving device also can based on the mean value calculation of the receiving voltage of the mean value of the requirement voltage of the receiving voltage of the requirement voltage of this wireless receiving device, this wireless receiving device, above-mentioned multiple wireless receiving device and above-mentioned multiple wireless receiving device.
In aforesaid way, such as, above-mentioned power transmission circuit has variable output voltage, above-mentioned control circuit is after making above-mentioned global error index minimize, when at least one in above-mentioned multiple wireless receiving device, the requirement voltage of this wireless receiving device and the error of receiving voltage exceed predetermined threshold value, reduce the output voltage of above-mentioned power transmission circuit, until above-mentioned error becomes below above-mentioned threshold value.
In aforesaid way, above-mentioned power transmission circuit also can possess: the power transformation circuit producing variable output voltage from input voltage; The translation circuit of the High frequency power of variable frequency is produced from the output voltage of above-mentioned power transformation circuit.
In aforesaid way, such as, above-mentioned power transmission circuit also can comprise by making to carry out the phase place change of the signal of switch motion to multiple switch and produce the translation circuit with the High frequency power of variable output voltage.
In aforesaid way, such as, above-mentioned power transmission circuit also can comprise by carrying out switch motion with variable duty ratio and produce the translation circuit of the High frequency power with variable output voltage.
In aforesaid way, such as, at least one party of above-mentioned power transmission antenna and above-mentioned power receiving antenna has variable circuit constant, and above-mentioned control circuit also can make the circuit constant of at least one party of above-mentioned power transmission antenna and above-mentioned power receiving antenna change.
In addition, above-mentioned mode can realize as the Wireless power transmission system possessing above-mentioned wireless power transmission device and above-mentioned multiple wireless receiving device.
In aforesaid way, such as, above-mentioned each wireless receiving device also can possess: power receiving antenna, possesses the resonant circuit comprising electricity reception coil; Transtation mission circuit, the value sending the requirement voltage of above-mentioned wireless receiving device to above-mentioned wireless power transmission device and the value of receiving voltage received from above-mentioned wireless power transmission device by above-mentioned wireless receiving device.
In aforesaid way, such as, above-mentioned each wireless receiving device can also possess rechargeable battery, accepts the supply of High frequency power and charge to above-mentioned rechargeable battery from above-mentioned wireless power transmission device.
Below, the Wireless power transmission system of execution mode is described with reference to accompanying drawing.
< the 1st execution mode >
Fig. 1 is the block diagram of the formation of the Wireless power transmission system representing the 1st execution mode.The Wireless power transmission system of Fig. 1 possesses: one that is connected with the supply unit 1 of direct current wireless power transmission device 2; With the multiple wireless receiving device 3-1 ~ 3-N accepting electric power supply from wireless power transmission device 2.
The wireless power transmission device 2 of Fig. 1 possesses oscillating circuit 21, multiple power transmission antenna 22-1 ~ 22-N, multiple receiving circuit 23-1 ~ 23-N and control circuit 24.Oscillating circuit 21 produces the High frequency power with variable frequency f0 and the translation circuit supplied to power transmission antenna 22-1 ~ 22-N.Power transmission antenna 22-1 ~ 24-N possesses the resonant circuit comprising power transmission coil respectively, with power receiving antenna 31-1 ~ 31-N (the describing below) electromagnetic coupled of each wireless receiving device 3-1 ~ 3-N.Receiving circuit 23-1 ~ 23-N is connected with power transmission antenna 22-1 ~ 24-N respectively, by making the power consumption of each wireless receiving device 3-1 ~ 3-N change, receiving also demodulation and being sent to the load modulation signal of wireless power transmission device 2 from each wireless receiving device 3-1 ~ 3-N.Thus, receiving circuit 23-1 ~ 23-N obtains the requirement voltage of this wireless receiving device value from each wireless receiving device 3-1 ~ 3-N and the value of receiving voltage received from wireless power transmission device 2 by this wireless receiving device, and be sent to control circuit 24.Control circuit 24 controls oscillating circuit 21, and the frequency f 0 of the High frequency power produced by oscillating circuit 21 is changed.
The frequency f 0 of the High frequency power produced by oscillating circuit 21 is set to such as 50Hz ~ 300GHz, is 100kHz ~ 10GHz, is typically 500kHz ~ 20MHz in certain example.In addition, the scope of 10kHz ~ 1GHz, 20kHz ~ 20MHz, 100kHz ~ 205kHz or 20kHz ~ 100kHz is set to according to purposes.In this manual, the electric power that the oscillating magnetic field by such frequency f 0 transmits is called " High frequency power (RF electric power) ".
The wireless receiving device 3-1 of Fig. 1 possesses power receiving antenna 31-1, rectification circuit 32-1, control circuit 33-1, transtation mission circuit 34-1 and load device 35-1.Power receiving antenna 31-1 possesses the resonant circuit comprising electricity reception coil, with at least one the power transmission antenna 22-1 electromagnetic coupled in power transmission antenna 22-1 ~ 24-N.When there is multiple wireless receiving device, power receiving antenna 31-1 ~ 31-N such as one_to_one corresponding of power transmission antenna 22-1 ~ 24-N and each wireless receiving device 3-1 ~ 3-N.Rectification circuit 32-1 is to carrying out rectification and smoothing via power receiving antenna 31-1 from the electric power that wireless power transmission device 2 receives and supplying to load device 35-1.Control circuit 33-1 obtains the value (that is, the value of the receiving voltage received from wireless power transmission device 2 by wireless receiving device 3-1) of the output voltage V1 of rectification circuit 32-1, and, obtain the value of the requirement voltage required by load device 35-1.And then transtation mission circuit 34-1 such as comprises the load-modulate circuit producing load modulation signal by making the power consumption of wireless receiving device 3-1 change.Thus transtation mission circuit 34-1 sends the value of requirement voltage of wireless receiving device 3-1 and the value of the receiving voltage V1 of wireless receiving device 3-1 under the control of control circuit 33-1 to wireless power transmission device 2.Load device 35-1 is such as rechargeable battery.When load device 35-1 is rechargeable battery, the supply that wireless receiving device 3-1 accepts High frequency power from wireless power transmission device 2 is charged to rechargeable battery.
Wireless receiving device 3-2 ~ the 3-N of Fig. 1 is also same with wireless receiving device 3-1 to be formed.
The Wireless power transmission system of Fig. 1 comprise by the 1st power transmission antenna 22-1 and the 1st power receiving antenna 31-1 form the 1st send by antenna to 4-1, by the 2nd power transmission antenna 22-2 and the 2nd power receiving antenna 31-2 form the 2nd send by antenna to 4-2 ..., the N to be made up of N power transmission antenna 22-N and N power receiving antenna 31-N send by antenna to 4-N, send by antenna between by magnetic Field Coupling transferring electric power in a non contact fashion.Send by antenna pair at n-th (1≤n≤N), power transmission antenna 22-n and power receiving antenna 31-n is with suitable coupling coefficient kn magnetic Field Coupling.Suitable coupling coefficient kn is set to that more than 0.01 less than 1, the preferably value of less than more than 0.1 0.75.In order to obtain suitable coupling coefficient kn, power transmission antenna and the mutual neighbor configuration of power receiving antenna.
Fig. 2 is the equivalent circuit figure representing the power transmission antenna 22-1 of Fig. 1 and the installation example of power receiving antenna 31-1.Power transmission antenna 22-1 and power receiving antenna 31-1 at least comprises inductor L1, L2 of coil shape, is coupled by magnetic Field Coupling.Capacitor is provided, to make to carry out resonance near frequency f 0 at least one party of power transmission antenna and power receiving antenna.Such as, as shown in Figure 2, power transmission antenna 22-1 is the series resonant circuit that inductor L1 and capacitor C1 are connected in series, and power receiving antenna 31-1 is the antiresonant circuit that inductor L2 and capacitor C2 are connected in parallel.In addition, the antiresonant circuit that the series resonant circuit of power transmission antenna 22-1 has a dead resistance components R 1, power receiving antenna 31-1 has dead resistance components R 2.Fig. 3 represents the power transmission antenna 22-1 of Fig. 1 and the power transmission antenna 22a-1 of the 1st variation of power receiving antenna 31-1 and the equivalent circuit figure of power receiving antenna 31a-1.Fig. 4 represents the power transmission antenna 22-1 of Fig. 1 and the power transmission antenna 22b-1 of the 2nd variation of power receiving antenna 31-1 and the equivalent circuit figure of power receiving antenna 31b-1.Fig. 5 represents the power transmission antenna 22-1 of Fig. 1 and the power transmission antenna 22c-1 of the 3rd variation of power receiving antenna 31-1 and the equivalent circuit figure of power receiving antenna 31c-1.The connection of inductor and capacitor can be series resonance, parallel resonance, both any one of combination.Different from the example of Fig. 2, power transmission antenna can form antiresonant circuit, and power receiving antenna also can form series resonant circuit.In addition, the antenna of a side also can be non-resonant circuit.
Other power transmission antenna 22-2 ~ 22-N of Fig. 1 and other power receiving antenna 31-2 ~ 31-N are also with the power transmission antenna of Fig. 2 ~ Fig. 5 and power receiving antenna is same forms.
In addition, as illustrated by the 3rd execution mode, the resonance frequency of power transmission antenna 22-1 ~ 22-N and the resonance frequency of power receiving antenna 31-1 ~ 31-N also can be variable.
The High frequency power exported from oscillating circuit 21 is transfused to the power transmission antenna 22-1 ~ 22-N be connected with oscillating circuit 21.The oscillating magnetic field coupling that power transmission antenna 22-1 ~ 22-N and power receiving antenna 31-1 ~ 31-N is formed by mutual resonant circuit, power receiving antenna 31-1 ~ 31-N can accept the High frequency power sent by power transmission antenna 22-1 ~ 22-N.Power receiving antenna 31-1 ~ 31-N does not contact with power transmission antenna 22-1 ~ 22-N and leaves such as 1mm ~ number about m from power transmission antenna 22-1 ~ 22-N.
In the Wireless power transmission system of Fig. 1, when supplying electric power to multiple wireless receiving device 3-1 ~ 3-N simultaneously, requirement voltage (target voltage) Vc1 of each wireless receiving device, Vc2,, VcN and the receiving voltage V1 received from wireless power transmission device 2 by this wireless receiving device, V2,, between VN, may error be produced.Below, the method for reducing this error is described.
Each wireless receiving device of control circuit 24 couples of wireless receiving device 3-1 ~ 3-N, calculate the relative error index E n of the error (=| Vn-Vcn|) of requirement voltage Vcn and the receiving voltage Vn (1≤n≤N) representing this wireless receiving device, according to the global error index E s of relative error index E 1 ~ EN calculating wireless receiving device 3-1 ~ 3-N of each wireless receiving device.In addition, relative error index E n is also referred to as error.
The relative error index E 1 ~ EN of each wireless receiving device and global error index E s is as given a definition.Voltage Vc1 will be required, Vc2 ..., the mean value of VcN is set to Vcav, receiving voltage V1, V2 ..., when the mean value of VN is set to Vav, the relative error index E 1 of wireless receiving device 3-1 is such as given by formula below.
[formula 1]
E1＝|(V1×Vcav÷Vav)-Vc1|
Require that the mean value Vcav of voltage is defined by formula below.
[formula 2]
Vcav＝(Vc1+Vc2+…+VcN)÷N
The mean value Vav of receiving voltage can be the simple average of receiving voltage V1 ~ VN, also can be average after weighting.When for the former, the mean value Vav of receiving voltage is defined by formula below.
[formula 3]
Vav＝(V1+V2+…+VN)÷N
The mean value Vav of the receiving voltage after weighting is defined by formula below.
[formula 4]
Vav＝(a1·V1+a2·V2+…+aN·VN)/(a1+a2+…+aN)
The mean value Vav of the receiving voltage after weighting such as can be used in setting large coefficient an to the wireless receiving device 3-n with large requirement electric power (1≤n≤N).
Such as, in any case the global error index E s of wireless receiving device 3-1 ~ 3-N, according to relative error index E 1 ~ EN, is defined by formula below.
[formula 5]
Es＝E1+E2+…+EN
Or
[formula 6]
Es＝E1 2+E2 2+…+EN 2
In addition, for global error index E s, also weighting can be considered, as formula definition below.
[formula 7]
Es＝b1×E1+b2×E2+…+bN×EN
Or
[formula 8]
Es=c1 × E1 m+ c2 × E2 m+ ... + cN × EN m(m: real number)
Control circuit 24 makes the frequency f 0 of the High frequency power produced by oscillating circuit 21 change, and minimizes to make global error index E s.
Fig. 6 is the flow chart of the power transmission control treatment performed by the control circuit 24 of the wireless power transmission device 2 of Fig. 1.
In step sl, the parameter n of iteration is initialized as 0 by control circuit 24.In step s 2, control circuit 24 produces High frequency power by oscillating circuit 21 with frequency f (n), and starts to transmit electric power.Frequency f (n) has predetermined initial value f (0) and amplification Δ f.Frequency f (n), from initial value f (0) to end value f (L), increases with amplification Δ f.Oscillating circuit 21 is set to: the High frequency power that can export whole frequencies that (L) increases with amplification Δ f from initial value f (0) to end value f.At this, amplification Δ f may not be certain.
Control circuit 24, after sending High frequency power from wireless power transmission device 2 to wireless receiving device 3-1 ~ 3-N, obtains the value of requirement voltage Vc1 ~ VcN of this wireless receiving device and the value of the receiving voltage V1 ~ VN of this wireless receiving device from each wireless receiving device 3-1 ~ 3-N.Control circuit 24 is voltage Vc1 ~ VcN and receiving voltage V1 ~ VN as requested, calculates global error voltage Es (n) and be stored in inside by formula 1 ~ formula 8.In step s3, control circuit 24 judges whether whole wireless receiving device 3-1 ~ 3-N medial error voltage meets predetermined benchmark, enters step S9, enter step S4 during "No" during "Yes".At this, error voltage can be the difference of requirement voltage Vc1 ~ VcN and receiving voltage V1 ~ VN, also can be relative error index E 1 ~ EN.
In step s 4 which, control circuit 24 makes parameter n increase progressively with 1.In step s 5, control circuit 24 is produced High frequency power with new frequency f (n) by oscillating circuit 21 and is transmitted electric power.Control circuit 24, after sending High frequency power from wireless power transmission device 2 to wireless receiving device 3-1 ~ 3-N, obtains the value of requirement voltage Vc1 ~ VcN of this wireless receiving device and the value of the receiving voltage V1 ~ VN of this wireless receiving device from each wireless receiving device 3-1 ~ 3-N.Control circuit 24 is voltage Vc1 ~ VcN and receiving voltage V1 ~ VN as requested, calculates global error voltage Es (n), and be stored in inside by formula 1 ~ formula 8.In step s 6, control circuit 24 judges whether whole wireless receiving device 3-1 ~ 3-N medial error voltage meets predetermined benchmark, enters step S9, enter step S7 during "No" during "Yes" again.In the step s 7, control circuit 24 judges that whether current global error index E s (n) is lower than former global error index E s (n-1), returns step S4, enter step S8 during "No" during "Yes".In step s 8, control circuit 24 makes the direction of search of frequency reverse (that is, being multiplied by-1 to amplification Δ f), returns step S4.
In step S4 ~ S8, by oscillating circuit 21, frequency is changed to f (n+1) from f (n), and search brings the frequency f (n) of minimum global error index E s (n).When global error index E s being increased by frequency is changed to f (n) from f (n-1), the value that frequency f (n+1) can be set to be made (f (n+1)-f (n)) and the symbol of (f (n)-f (n-1)) is so on the contrary.In addition, when making global error index E s reduce by frequency is changed to f (n) from f (n-1), the identical such value of symbol making (f (n+1)-f (n)) and (f (n)-f (n-1)) can be set to.Suitable with the amplification (resolution of frequency adjustment) of frequency | f (n+1)-f (n) | and | f (n)-f (n-1) | may not be same value.
Describe above-mentioned step S4 ~ step S8 in detail.In the step s 7, control circuit 24 the 1st summation Es (n-1) that relatively the above-mentioned requirements voltage of each wireless receiving device above-mentioned when sending corresponding with the 1st frequency f (n-1) in above-mentioned multiple frequency and initial value f (0) ~ end value f (L) High frequency power and the error of above-mentioned receiving voltage added up to and obtained and to sending the 2nd summation Es (n) adding up to the above-mentioned requirements voltage of each wireless receiving device above-mentioned during the High frequency power that the 2nd frequency f (n) in above-mentioned multiple frequency is corresponding and the error of above-mentioned receiving voltage and obtain
First, the action during "Yes" of description of step S7.In this situation, above-mentioned 2nd summation Es (n) is less than above-mentioned 1st summation Es (n-1), therefore, and the frequency that the summation that above-mentioned 2nd frequency f (n) becomes above-mentioned error is little.Now, each error above-mentioned also diminishes.Then, control circuit 24 makes above-mentioned 2nd frequency f (n) increase amplification Δ f (step S4), sets the 3rd frequency close to above-mentioned 2nd frequency f (n).
Then, the action (action of step S8) during the "No" of description of step S7.In this situation, above-mentioned 2nd summation Es (n) is larger than above-mentioned 1st summation Es (n-1), therefore, and the frequency that the summation that above-mentioned 1st frequency f (n-1) becomes above-mentioned error is little.Now, each error above-mentioned also diminishes.Then, control circuit 24 sets the 3rd frequency close to above-mentioned 1st frequency f (n-1).
At this, the implication of the 3rd frequency close to above-mentioned 1st frequency f (n-1) is described.Above-mentioned 3rd frequency refer to than frequency f (n)-| f (n)-f (n-1) |/2 low frequencies.That is, the 3rd frequency setting becomes the frequency lower than above-mentioned 2nd frequency f (n), therefore, is reversed to low frequency (step S8) from above-mentioned 2nd frequency f (n).
Above, from above-mentioned multiple each frequency f (0) ~ f (L), by repeatedly setting the summation that reduces above-mentioned error and reducing above-mentioned 3rd frequency of above-mentioned error, can whole for above-mentioned multiple wireless receiving device, by above-mentioned control errors in predetermined benchmark.
In step s 9, receiving voltage V1 ~ VN is in respectively and requires the state that voltage Vc1 ~ VcN is fully consistent, and control circuit 24 continues the High frequency power that transmission has frequency f (n).In step slo, control circuit 24, such as when there is the requirement from the stopping power transmission of wireless receiving device 3-1 ~ 3-N, terminates the transmission of High frequency power.According to the Wireless power transmission system of Fig. 1, the output voltage that can control wireless power transmission device 2 meets target voltage ranges to make the receiving voltage of each wireless receiving device 3-1 ~ 3-N, thus realizes electric power transfer.
The object of the Wireless power transmission system of Fig. 1 is the balance keeping relative error index E 1 ~ EN, and reduces global error index E s when simultaneously supplying electric power to multiple wireless receiving device.In the formula of relative error index E n (1≤n≤N) deriving each wireless receiving device 3-n, not only consider requirement voltage Vcn and the receiving voltage Vn of this wireless receiving device 3-n, also consider the mean value Vav of the mean value Vcav of the requirement voltage of multiple wireless receiving device 3-1 ~ 3-N and the receiving voltage of multiple wireless receiving device 3-1 ~ 3-N, suitably can maintain the balance of the action of multiple wireless receiving device 3-1 ~ 3-N thus.
Fig. 7 is the block diagram of the formation of the Wireless power transmission system of the variation representing the 1st execution mode.Power transmission antenna 22-1 ~ 22-N and power receiving antenna 31-1 ~ 31-N is not limited to one_to_one corresponding, also can from power transmission sky alignment multiple power receiving antenna supply electric power.The wireless power transmission device 2A of Fig. 7 replaces power transmission antenna 22-1,22-2 and receiving circuit 23-1,23-2 of the wireless power transmission device 2 of Fig. 1, possesses power transmission antenna 22A-1 and receiving circuit 23A-1.The power receiving antenna 31-1 of power transmission antenna 22A-1 and wireless receiving device 3-1,3-2,31-2 electromagnetic coupled.Receiving circuit 23A-1 is connected with power transmission antenna 22A-1, receives also demodulation and is sent to the load modulation signal of wireless power transmission device 2 from wireless receiving device 3-1,3-2.By the Wireless power transmission system of Fig. 7, same with the Wireless power transmission system of Fig. 1, the output voltage that also can control wireless power transmission device 2A meets target voltage ranges to make the receiving voltage of each wireless receiving device 3-1 ~ 3-N, thus realizes electric power transfer.
Inputted direct current power is typically transformed to the High frequency power (DC-RF conversion) of frequency f 0 by oscillating circuit 21.Oscillating circuit 21 can adopt D level, E level, F level etc. to realize high efficiency and the amplifier of low distortion characteristic, also can adopt Doherty (Doherty) amplifier.In oscillating circuit 21, by producing the rear class configuration low pass filter, band pass filter or the band stop filter that comprise the switch element of the output signal of distortion components, also can generate high efficiency sine wave.Inputted alternating electromotive force also can be transformed to High frequency power by oscillating circuit 21.
Receiving voltage V1 ~ the VN of wireless receiving device 3-1 ~ 3-N is not limited to the direct voltage of rectification shown in Fig. 1 and Fig. 7.When wireless receiving device does not have rectification circuit, this receiving voltage also can be the output voltage of power receiving antenna.When wireless receiving device replaces rectification circuit and possesses frequency changer circuit, this receiving voltage also can be the alternating voltage exported from frequency changer circuit.In this case, the control circuit 24 of wireless power transmission device 2 also voltage Vc1 ~ VcN and receiving voltage V1 ~ VN as requested, calculates relative error index E 1 ~ EN and the global error index E of each wireless receiving device s.
Each wireless receiving device 3-1 ~ 3-N requires the value of voltage Vc1 ~ VcN and the value of receiving voltage V1 ~ VN to send to wireless power transmission device 2, the path beyond power receiving antenna 31-1 ~ 31-N and power transmission antenna 22-1 ~ 22-N can be adopted, also can adopt the communication means beyond load modulation signal.
< the 2nd execution mode >
In the Wireless power transmission system of the 2nd execution mode, the oscillating circuit 21 of the Wireless power transmission system of the 1st execution mode is configured to have variable output voltage.When increasing and decreasing the output voltage of oscillating circuit 21, receiving voltage V1 ~ VN can be increased and decreased while the ratio between the receiving voltage V1 ~ VN roughly keeping multiple wireless receiving device 3-1 ~ 3-N.
Fig. 8 is the block diagram of the formation of the Wireless power transmission system representing the 2nd execution mode.The wireless power transmission device 2B of Fig. 8, except the formation of the wireless power transmission device 2 of Fig. 1, also possesses voltage regulator circuit 25, in addition, replaces the control circuit 24 of Fig. 1 and possesses control circuit 24B.The input voltage that voltage regulator circuit 25 is obtained by the supply unit 1 from direct current, produces variable output voltage.Voltage regulator circuit 25 is such as DC/DC converter, AC/DC converter etc.Oscillating circuit 21, from the output voltage of voltage regulator circuit 25, produces the High frequency power of variable frequency.In addition, oscillating circuit 21 has variable input voltage (output voltage of voltage regulator circuit 25), and result, has variable output voltage.Control circuit 24B control voltage regulating circuit 25, makes the output voltage of voltage regulator circuit 25 change, and controls oscillating circuit 21, the frequency f 0 of the High frequency power produced by oscillating circuit 21 is changed.
Fig. 9 is the block diagram of the formation of the Wireless power transmission system of the variation representing the 2nd execution mode.The wireless power transmission device 2C of Fig. 9 replaces the oscillating circuit 21 of the wireless power transmission device 2 of Fig. 1 and control circuit 24 and possesses oscillating circuit 21C and control circuit 24C.Oscillating circuit 21C produces the translation circuit with the High frequency power of variable output voltage by making multiple switch carry out the phase place change of the signal of switch motion.
Figure 10 is the circuit diagram of the detailed formation of the oscillating circuit 21C representing Fig. 9.Oscillating circuit 21C is the full-bridge circuit possessing multiple switch S 1 ~ S4 and pulse-generating circuit 21Ca.Pulse-generating circuit 21Ca, under the control of control circuit 24C, produces and makes switch S 1 ~ S4 carry out the signal of switch motion.Switch S 1 is closed when switch S 2 disconnects, and switch S 2 is closed when switch S 1 disconnects.Equally, switch S 3 is closed when switch S 4 disconnects, and switch S 4 is closed when switch S 3 disconnects.The signal making switch S 3, S4 carry out switch motion has predetermined phase difference θ t relative to making switch S 1, S2 carry out the signal of switch motion.When this phase difference θ t changes, the output voltage change of oscillating circuit 21C.
Control circuit 24C controls oscillating circuit 21C, makes frequency f 0 and the output voltage change of the High frequency power produced by oscillating circuit 21C.
In fig .9, oscillating circuit 21C replaces the phase place change making multiple switch carry out the signal of switch motion, and by carrying out switch motion to produce the translation circuit of the High frequency power with variable output voltage with variable duty ratio.
The Wireless power transmission system of the 2nd execution mode, the output voltage of oscillating circuit 21 is increased and decreased by one of above 3 unit or its combination, ratio between the receiving voltage V1 ~ VN roughly keeping multiple wireless receiving device 3-1 ~ 3-N, and make receiving voltage V1 ~ VN close to requiring voltage Vc1 ~ VcN.
Figure 11 is the flow chart representing the power transmission control treatment performed by the control circuit 24B of the wireless power transmission device 2B of Fig. 8.Control circuit 24B is after making global error index E s minimize, when the requirement voltage of this wireless receiving device at least one in multiple wireless receiving device 3-1 ~ 3-N and the error of receiving voltage exceed predetermined threshold value, the output voltage of oscillating circuit 21 is reduced, until error becomes below threshold value.Step S1 ~ S6, S9 ~ S10 of step S11 ~ S16, S21 ~ S22 and Fig. 6 of Figure 11 is same.In step S17, control circuit 24B judges that whether current global error index E s (n) is lower than former global error index E s (n-1), returns step S14, enter step S18 during "No" during "Yes".In step S18, control circuit 24B judges that the global error index E s (n-2) in global error index E s (n-1) in the previous iteration n-1 iteration n-2 whether than first 2 is low, enter step S19 during "Yes", during "No", enter step S22.When step S18 is "Yes", the global error index E s (n-1) in previous iteration n-1 is minimum.Thus, when with frequency f (n-1) carry high frequency electric power, require that the error between voltage Vc1 ~ VcN and receiving voltage V1 ~ VN is roughly equal each other.In step S19, control circuit 24B makes parameter n increase progressively with 1.In step S20, control circuit 24B makes the output voltage of oscillating circuit 21 reduce.By reducing the output voltage of oscillating circuit 21, the ratio between the receiving voltage V1 ~ VN that roughly can keep multiple wireless receiving device 3-1 ~ 3-N, a step of going forward side by side lowers the requirement the error between voltage Vc1 ~ VcN and receiving voltage V1 ~ VN.The voltage ratio reduced is Vc1/V1.In the step s 21, receiving voltage V1 ~ VN is in respectively and requires the state that voltage Vc1 ~ VcN is fully consistent, and control circuit 24B continues the High frequency power that transmission has frequency f (n).In step S22, control circuit 24B, when there is the requirement from the stopping power transmission of such as wireless receiving device 3-1 ~ 3-N, terminates the transmission of High frequency power.
In the step S20 of Figure 11, when whole wireless receiving device 3-1 ~ 3-N medial error voltage meets predetermined benchmark and has enough and to spare, also can increase the output voltage of oscillating circuit 21.
Illustrated by with reference to Figure 11, after discovery makes the minimized frequency of global error index E s, by increasing and decreasing the output voltage of oscillating circuit 21, the error that can lower the requirement further between voltage Vc1 ~ VcN and receiving voltage V1 ~ VN.When inventor finds the relative error index E 1 ~ EN defining each wireless receiving device 3-1 ~ 3-N by formula 1 ~ formula 8, in the front and back making the output voltage of oscillating circuit 21 increase and decrease, the frequency characteristic of global error index E s changes hardly.Thus, even if carry out voltage control in the non-order of convergence section of the global error index E s reduced because of FREQUENCY CONTROL, the value of global error index E s also changes hardly.Therefore, it is possible to carry out FREQUENCY CONTROL and voltage control simultaneously, and the receiving voltage of the wireless receiving device simultaneously carrying out the multiple stage of action is controlled in target zone.
The power transmission control treatment of Figure 11 also can be performed by the control circuit 24C of Fig. 9 equally.
< the 3rd execution mode >
Figure 12 is the block diagram of the formation of the Wireless power transmission system representing the 3rd execution mode.In the Wireless power transmission system of Figure 12, at least one party of power transmission antenna and power receiving antenna has variable circuit constant, and the control circuit of wireless power transmission device makes the circuit constant of at least one party of power transmission antenna and power receiving antenna change.
The wireless power transmission device 2D of Figure 12 replaces the power transmission antenna 22-1 ~ 22-N of the wireless power transmission device 2 of Fig. 1 and control circuit 24 and possesses power transmission antenna 22D-1 ~ 22D-N and control circuit 24D.Power transmission antenna 22D-1 ~ 22D-N has variable circuit constant.Control circuit 24D makes the circuit constant of power transmission antenna 22D-1 ~ 22D-N change.
The wireless receiving device 3D-1 of Figure 12 replaces the power receiving antenna 31-1 of the wireless receiving device 3-1 of Fig. 1 and control circuit 33-1 and possesses power receiving antenna 31D-1 and control circuit 33D-1.Power receiving antenna 31D-1 has variable circuit constant.Control circuit 33D-1, under the control of the control circuit 24D of wireless power transmission device 2D, makes the circuit constant of power receiving antenna 31D-1 change.Other wireless receiving devices 3D-2 ~ 3D-N is also same with wireless receiving device 3D-1 to be formed.
Figure 13 is the equivalent circuit figure representing the power transmission antenna 22D-1 of Figure 12 and the installation example of power receiving antenna 31D-1.The circuit constant (inductance or electric capacity) of at least one party of the inductor that power transmission antenna 22D-1 and power receiving antenna 31D-1 comprises and capacitor is variable.Figure 14 is the circuit diagram of the installation example of the capacitor C1 representing Figure 13.Figure 14 is as an example, and expression power transmission antenna 22D-1 comprises the formation during resonant capacitor with variable capacitance.If the circuit forming Figure 14 is formed, then by the opening and closing of interrupteur SW, any one of the combined capacity of electric capacity C0 and C0 and Cad can be selected.The value of the electric capacity Cad added such as is in the scope of 0.5 times to about 10 times relative to C0.Control circuit 24D sends the control signal for changing needed for circuit constant, and by controlling the circuit characteristic of inductance or electric capacity etc., result makes antenna performance variable.
In the 3rd execution mode, by the circuit constant of at least one party of the circuit constant and power receiving antenna that change power transmission antenna, the frequency characteristic change of global error index E s.Due at least any one the equivalent impedance change of power transmission antenna and power receiving antenna, so regulate by the tendency that the frequency characteristic of global error index E s compared with is before changing different.Even if perform the power transmission control treatment of the 1st and the 2nd execution mode, still exist and be difficult to the whole of receiving voltage V1 ~ VN to control in the situation requiring voltage Vc1 ~ VcN.By importing the formation of the 3rd execution mode, controlling the frequency characteristic of global error index E s, the possibility solving this problem can be increased.
The circuit constant of the circuit constant of power transmission antenna and at least one party of power receiving antenna also can be controlled by the control circuit 33D-1 ~ 33D-N of wireless receiving device 3D-1 ~ 3D-N.
By the effect changing effect that circuit constant produces and bring independent of the effect brought of FREQUENCY CONTROL imported by the 1st execution mode and the voltage control that imported by the 2nd execution mode.Thus, also control circuit constant can independently be carried out with the timing of the control carrying out frequency and voltage.
< variation >
In addition, when the receiving voltage of wireless receiving device allows predetermined error range, the definition of the mean value Vav of receiving voltage can also be revised after considering above-mentioned error range.Such as, allowing that receiving voltage is defined as relative to requiring that voltage Vc1 is when (Vc10 ± Vc1e) is within the scope of this, the value of the requirement voltage Vc1 of the mean value Vav of reflection receiving voltage can selected from (Vc10+Vc1e) scope below more than (Vc10-Vc1e).
In addition, to require the wireless receiving device of power transmission whole cannot supply the electric power met the demands time, except a part for the wireless receiving device of the object that also electric power can be supplied, only remaining wireless receiving device search is reduced to the condition of global error index E s, carry out electric power supply based on this result.In this situation, the switch element that the control circuit 24 by wireless power transmission device 2 can be carried out break-make is arranged between oscillating circuit 21 and power transmission antenna 22-1 ~ 22-N, on the path connected from the power transmission antenna relative with the power receiving antenna of wireless receiving device except the object carrying out electric power supply, above-mentioned switch is set to nonconducting state.
Below, with reference to Figure 15 ~ Figure 18, the analog result of embodiment of the present disclosure is described.
Figure 15 is the figure representing receiving voltage V1, the V2 of execution mode 1, the frequency characteristic of global error index E s.As execution mode 1, in the operating frequency scope of frequency 100kHz ~ 140kHz, for coupling coefficient be the symmetry of 0.25 send by antenna pair, be made into the Wireless power transmission system simultaneously carrying out charging with an oscillating circuit (full-bridge circuit).There are 2 wireless receiving devices 3-1,3-2, require 5V respectively as charging voltage, the charging voltage error of allowing is 200mV.In addition, the rechargeable battery of wireless receiving device 3-1,3-2 is in the asymmetrically placed load state requiring 1.16A and 0.93A respectively.At this, relative to requiring voltage Vc1=Vc2=5V, with the DC driven oscillating circuit of 8V, operating frequency f0 being changed, and measuring receiving voltage V1, V2.In addition, wireless receiving device 3-1,3-2 possess rectification circuit 32-1,32-2 of comprising diode bridge in the rear class of power receiving antenna 31-1,31-2, measure receiving voltage V1, V2 of direct current.In addition, be set to Vcav=5V, calculate relative error index E 1, E2 by formula 1, calculate global error index E s by formula 5.
According to Figure 15, known when 126.5kHz from the frequency characteristic of global error index E s, global error index E s is minimum.In addition, receiving voltage V1, V2 of 126.5kHz are respectively 4.842V and 5.16V, and the charging can carrying out 5V ± 0.16V controls.
Figure 16 is the figure (when the input voltage of oscillating circuit 21 is 10V) representing receiving voltage V1, the V2 of embodiment 2, the frequency characteristic of global error index E s.As embodiment 2, in the Wireless power transmission system of embodiment 1, in the prime of oscillating circuit, be connected with the DC/DC converter input voltage of 12V being depressured to predetermined voltage.Requirement voltage Vc1, the Vc2 of wireless receiving device 3-1,3-2 in embodiment 2 are 4.3V, and the charging voltage error of allowing is 150mV.In addition, the rechargeable battery of wireless receiving device 3-1,3-2 is in the asymmetrical load condition requiring 1A and 0.8A respectively.According to Figure 16, because global error index E s becomes minimum at 127kHz, therefore known when charging to multiple wireless receiving device 3-1,3-2 simultaneously optimum frequency be 127kHz.Figure 17 is the figure (when the input voltage of oscillating circuit 21 is 6.94V) representing receiving voltage V1, the V2 of embodiment 2, the frequency characteristic of global error index E s.Then, the operation condition of adjustment DC/DC converter, controls the direct voltage inputted to oscillating circuit 21.The mean value of receiving voltage V1, V2 when input voltage being set to 10V and carrying out action is 6.2V, therefore, as input voltage, have selected 10 (V) × 4.3 (V) ÷ 6.2 (V)=6.94 (V).From the comparative result of Figure 16 and Figure 17, the frequency characteristic of global error index E s does not rely on the input voltage of oscillating circuit, same when being 10V with input voltage, indicate 127kHz to be optimum frequency when charging to multiple wireless receiving device 3-1,3-2 simultaneously.In addition, by FREQUENCY CONTROL and voltage control function and use, obtain V1=4.173V, V2=4.440V, the receiving voltage of two sides all meets the demands voltage and 4.3V (± 140mV).
Figure 18 is the figure of the frequency characteristic of the global error index E s representing execution mode 3.In execution mode 1,2, at power transmission antenna circuit, inductor is connected to the series capacitor of 180nF, form resonant circuit.In embodiment 3, the capacitor of the power transmission antenna of embodiment 1,2 is set to the variable capacitance circuit shown in Figure 14.Be set to C0=180nF, Cad=360nF.In the side high with load in wireless receiving device 3-1,3-2 and the relative power transmission antenna 22D-1 of wireless receiving device 3-1, be configured to make electric capacity switch between the combined capacity and 120nF of 180nF and 180nF and 360nF.
The requirement voltage of wireless receiving device 3-1,3-2 in embodiment 3 is 4.3V (Vcav=4.3V), and the charging voltage error of allowing is 50mV.In addition, the rechargeable battery of wireless receiving device 3-1,3-2 is in the asymmetrical load condition requiring 1A and 0.5A respectively.In figure 18, dotted line represents that the electric capacity of the capacitor of 2 power transmission antennas 22D-1,22D-2 is all set to fixed value and 180nF, and the input voltage of subtend oscillating circuit 21 is set to the situation of 8V (comparative example).In figure 18, solid line represents only regulating circuit constant in the power transmission antenna 22D-1 of side relative to wireless receiving device 3-1, the electric capacity of capacitor is changed to the situation (embodiment 3) of 120nF.According to Figure 18, compared with comparative example, embodiment 3 can reduce the minimum of global error index E s.The receiving voltage of multiple wireless receiving device balance can, by controlling variable capacitance circuit to reduce the resonant capacitance of the power transmission antenna of powering to the wireless receiving device of load height side, can control requiring voltage by this expression well.
In order to more specifically verify, in a comparative example, the input voltage (output voltage of DC/DC converter) of oscillating circuit 21 is set to optimum value and 6.6V, when setting 127kHz and making oscillating circuit 21 carry out action, cannot make to be reduced to respectively lower than-359mV ~ 366mV from the error requiring voltage Vc1, Vc2 to receiving voltage V1, V2.On the other hand, in execution mode 3, the input voltage of oscillating circuit 21 is set to optimum value and 5.3V, when setting 121kHz and making oscillating circuit 21 carry out action, can be reduced to from the error requiring voltage Vc1, Vc2 to receiving voltage V1, V2 respectively in the scope of+22mV ~-21mV.
Execution mode disclosed herein is all illustrate in all respects, and is not intended to limit.The scope of the present disclosure is not determined by above explanation, but is determined by the scope of claim, is intended to comprise whole modes of the distortion in the implication and right that comprise and be equal to the scope of claim.
[utilizing possibility in industry]
Wireless power transmission device of the present disclosure and Wireless power transmission system are when supplying electric power from a wireless power transmission device to multiple wireless receiving device simultaneously, oscillating circuit is set without the need to the wireless receiving device by correspondence, the output voltage of wireless power transmission device can be controlled accurately.Thus, a kind of low cost can be provided and the high wireless power transmission device (such as contactless charger) of versatility.
Wireless power transmission device of the present disclosure and Wireless power transmission system can be applicable to the electronic equipment, the battery-operated motor cycle that adopt rechargeable battery, the charging system of electrically assisted bicycle or electric motor car.In addition, wireless power transmission device of the present disclosure and Wireless power transmission system can be applicable to the electric power system of powering to various equipment such as AV equipment and white domestic appliances.At this, AV equipment such as comprises smart mobile phone, panel computer terminal installation, TV and laptop PC, and white domestic appliances such as comprise washing machine, refrigerator and air conditioner.
Label declaration
1 ... supply unit,
2,2A ~ 2D ... wireless power transmission device,
3-1 ~ 3-N, 3D-1 ~ 3D-N ... wireless receiving device,
4-14 ~ 4-N ... send by antenna pair,
21,21C ... translation circuit,
21Ca ... pulse-generating circuit,
22-1 ~ 22-N, 22A, 22D-1 ~ 22D-N ... power transmission antenna,
23-1 ~ 23-N, 23A ... receiving circuit,
24,24B ~ 24D ... control circuit,
25 ... voltage regulator circuit,
31-1 ~ 31-N, 31D-1 ~ 31D-N ... power receiving antenna,
32-1 ~ 32-N ... rectification circuit,
33-1 ~ 33-N, 33D-1 ~ 33D-N ... control circuit,
34-1 ~ 34-N ... transtation mission circuit,
35-1 ~ 35-N ... load device,
C1 ~ C3, C0, Cad ... capacitor,
L1 ... power transmission coil,
L2 ... electricity reception coil,
R1, R2 ... dead resistance component,
S1 ~ S4, SW ... switch.

Claims (5)

1. a wireless power transmission device, is the wireless power transmission device of the Wireless power transmission system sending High frequency power to multiple wireless receiving device, possesses:
Power transmission antenna, to each wireless receiving device of above-mentioned multiple wireless receiving device, sends each High frequency power corresponding with multiple frequency;
Multiple receiving circuit, from each wireless receiving device of above-mentioned multiple each wireless receiving device, obtain the value of the value of the requirement voltage of each wireless receiving device above-mentioned and the receiving voltage of above-mentioned each wireless receiving device corresponding with each frequency of above-mentioned multiple frequency; And
Control circuit, obtains the value of above-mentioned requirements voltage and the value of above-mentioned receiving voltage from above-mentioned multiple receiving circuit, controls the frequency of the High frequency power sent to each wireless receiving device of above-mentioned multiple wireless receiving device,
Above-mentioned control circuit,
The High frequency power corresponding with above-mentioned each frequency is sent to above-mentioned multiple wireless receiving device successively with each frequency in above-mentioned multiple frequency,
Relatively the 1st summation and the 2nd summation, the summation that the above-mentioned requirements voltage of each wireless receiving device above-mentioned when above-mentioned 1st summation is the High frequency power to transmission is corresponding with the 1st frequency in above-mentioned multiple frequency and the error of above-mentioned receiving voltage add up to and obtain, above-mentioned 2nd summation is the summation adding up to the above-mentioned requirements voltage of each wireless receiving device above-mentioned when sending the High frequency power corresponding with the 2nd frequency in above-mentioned multiple frequency and the error of above-mentioned receiving voltage and obtain
Setting is close to the 3rd frequency of the frequency corresponding with the summation of an a certain less side in above-mentioned 1st summation and above-mentioned 2nd summation, and each wireless receiving device to above-mentioned multiple wireless receiving device sends the High frequency power corresponding with above-mentioned 3rd frequency,
For each wireless receiving device of above-mentioned multiple wireless receiving device, by above-mentioned control errors in predetermined benchmark.
2. wireless power transmission device according to claim 1,
The summation of a side less in more above-mentioned 1st summation of above-mentioned control circuit and above-mentioned 2nd summation and the 3rd summation, the summation that the above-mentioned requirements voltage of each wireless receiving device above-mentioned when above-mentioned 3rd summation is the High frequency power to transmission is corresponding with above-mentioned 3rd frequency and the error of above-mentioned receiving voltage add up to and obtain, setting is close to the 4th frequency of the frequency corresponding with the summation of a side less in the summation and above-mentioned 3rd summation of an above-mentioned less side, each wireless receiving device to above-mentioned multiple wireless receiving device sends the High frequency power corresponding with above-mentioned 4th frequency,
Repeat the summation that above-mentioned process decides above-mentioned error and become minimum frequency, each wireless receiving device to above-mentioned multiple wireless receiving device sends and the summation of above-mentioned error becomes High frequency power corresponding to minimum frequency.
3. wireless power transmission device according to claim 2,
Above-mentioned wireless power transmission device also possesses: voltage regulator circuit, makes the magnitude of voltage change from the voltage of supply unit input and exports to above-mentioned power transmission antenna,
Above-mentioned control circuit is after making the summation of above-mentioned error minimize, in at least one wireless receiving device in above-mentioned multiple wireless receiving device, when the error of above-mentioned requirements voltage and above-mentioned receiving voltage exceedes predetermined threshold value, magnitude of voltage from above-mentioned voltage regulator circuit to above-mentioned power transmission antenna that export from is reduced, makes the error of above-mentioned requirements voltage at least one wireless receiving device above-mentioned and above-mentioned receiving voltage below above-mentioned threshold value.
4. the wireless power transmission device according to any one in claims 1 to 3,
At least one party of the power receiving antenna of above-mentioned power transmission antenna and above-mentioned wireless receiving device comprises the circuit element with variable circuit constant,
Above-mentioned control circuit makes the circuit constant of at least one party of above-mentioned power transmission antenna and above-mentioned power receiving antenna change.
5. a Wireless power transmission system, possesses:
Above-mentioned wireless power transmission device according to any one of Claims 1 to 4; With
Above-mentioned multiple wireless receiving device.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017133238A1 (en) * 2016-02-01 2017-08-10 施京京 Method and circuit for wireless transmission of high-power electrical energy
JP2017200319A (en) * 2016-04-27 2017-11-02 清水建設株式会社 Wireless power transmission apparatus and wireless power transmission apparatus system
CN110244808A (en) * 2019-07-03 2019-09-17 西安易朴通讯技术有限公司 Voltage adjusting method, device, equipment and storage medium
CN112640254A (en) * 2019-03-14 2021-04-09 欧姆龙株式会社 Wireless power transmission device and wireless power transmission system

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6174964B2 (en) * 2013-09-30 2017-08-02 キヤノン株式会社 Power transmission control device, power reception control device, power transmission control method, power reception control method, and program
JP6220211B2 (en) 2013-10-01 2017-10-25 キヤノン株式会社 Power transmission control device, power transmission control method, and program
JP6242311B2 (en) * 2013-10-29 2017-12-06 パナソニック株式会社 Wireless power transmission apparatus and wireless power transmission system
JP2015133815A (en) 2014-01-10 2015-07-23 船井電機株式会社 Power supply device, power supply method, and power receiving device
US20150288216A1 (en) * 2014-04-05 2015-10-08 Che-Min Wu Remote wireless charging system
EP3143702B1 (en) * 2014-05-12 2021-07-07 CommScope Technologies LLC Remote radio heads having wireless jumper connections and related equipment, systems and methods
JP6187384B2 (en) * 2014-05-22 2017-08-30 株式会社デンソー Power transmission equipment
EP3272026B1 (en) * 2015-03-20 2020-04-29 Andrew Wireless Systems GmbH Module for combining signals having different frequencies
ES2721524T3 (en) * 2015-05-19 2019-08-01 Panasonic Ip Man Co Ltd Contactless power supply apparatus and contactless power receiving apparatus, and contactless power transmission system provided therewith
US10291036B2 (en) * 2015-07-17 2019-05-14 Mediatek Inc. Multi-mode resonant wireless power transmitter
CN106560981B (en) * 2015-10-02 2021-04-27 松下知识产权经营株式会社 Wireless power transmission system
HUE062525T2 (en) 2015-11-05 2023-11-28 Lg Electronics Inc Wireless power transmitter and receiver for vehicle
KR20170053237A (en) * 2015-11-06 2017-05-16 엘지이노텍 주식회사 Multi-Coil Wireless Charging Method and Apparatus and System therefor
US9924704B2 (en) * 2015-11-25 2018-03-27 Qualcomm Incorporated Devices and methods for harmonic power control for wireless power transmission
JP6702541B2 (en) * 2016-03-14 2020-06-03 株式会社東芝 Wireless power transmission device, power transmission device, and power reception device
CN109314404A (en) 2016-06-06 2019-02-05 富士通株式会社 Electrical power transmission system
JP6945188B2 (en) * 2016-11-30 2021-10-06 パナソニックＩｐマネジメント株式会社 Wireless power supply unit, power transmission module, power receiving module and wireless power transmission system
WO2018179442A1 (en) * 2017-03-31 2018-10-04 富士通株式会社 Wireless power transfer system, wireless power transfer method, wireless power transfer program, and power transmitter and power receiver
WO2018221532A1 (en) * 2017-06-02 2018-12-06 日本電産株式会社 Power transmission device, wireless power transmission system, and control device
WO2019097806A1 (en) * 2017-11-15 2019-05-23 三菱電機株式会社 Rectifier and rectenna device
KR102032619B1 (en) 2017-11-29 2019-10-15 연세대학교 산학협력단 Apparatus for Transmitting Wireless Power for multiple simultaneous charging and Appratus for Receiving Wireless Power
US11258306B2 (en) * 2017-12-29 2022-02-22 The Trustees Of Princeton University System and method for reactance steering network (RSN)
CN108471170A (en) * 2018-03-21 2018-08-31 哈尔滨工业大学 Expansible satellite-carried wireless energy transmission system
CN112203890B (en) * 2018-04-23 2024-03-22 Abb电动交通有限公司 Power transmission system of electric vehicle and control method thereof
CN109104000B (en) * 2018-10-10 2021-07-30 上海交通大学 Single-input multi-output control system and method based on magnetic coupling resonance
CN113555978B (en) * 2020-04-23 2022-10-21 深圳市万普拉斯科技有限公司 Wireless charging and discharging deviation detection method and device, electronic equipment and storage medium
US20230299616A1 (en) * 2020-08-10 2023-09-21 Lg Electronics Inc. Wireless power transmission device
CN111934445B (en) * 2020-09-29 2021-01-01 深圳英集芯科技有限公司 Wireless energy switching circuit, wireless charging chip and electronic equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007020583A2 (en) * 2005-08-16 2007-02-22 Access Business Group International Llc Inductive power supply, remote device powered by inductive power supply and method for operating same
CN102918748A (en) * 2011-04-26 2013-02-06 松下电器产业株式会社 Wireless power transmission device
JP2013034367A (en) * 2011-06-30 2013-02-14 Semiconductor Energy Lab Co Ltd Non-contact power supply device
US20130062961A1 (en) * 2011-09-09 2013-03-14 Yongcheol PARK Wireless power system and resonant frequency changing method thereof

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7331976B2 (en) 2003-04-29 2008-02-19 Rex Medical, L.P. Distal protection device
US8855554B2 (en) * 2008-03-05 2014-10-07 Qualcomm Incorporated Packaging and details of a wireless power device
JP2010016985A (en) 2008-07-03 2010-01-21 Sanyo Electric Co Ltd Method of data transmission in electric power transmission, and charging stand and battery built-in device using the method
KR101042419B1 (en) 2010-10-13 2011-06-16 유현상 Gas welding equipment equipped with automatic opening and closing feature
JPWO2012081519A1 (en) 2010-12-15 2014-05-22 三洋電機株式会社 Charging stand
JP2012164744A (en) 2011-02-04 2012-08-30 Murata Mfg Co Ltd Three-terminal capacitor mounting structure and three-terminal capacitor mounting method
WO2012157927A2 (en) * 2011-05-13 2012-11-22 삼성전자 주식회사 Transmitter and receiver in a wireless power transmitting system, and method for the transmitter and receiver to wirelessly transmit/receivetransceive power
KR20140022920A (en) 2011-06-03 2014-02-25 도요타지도샤가부시키가이샤 Non-contact power reception device, vehicle comprising same, non-contact power transmission device, and non-contact power transmission system
US9306401B2 (en) * 2011-06-29 2016-04-05 Lg Electronics Inc. Wireless power transmitter and wireless power transfer method thereof in many-to-one communication
JP6164287B2 (en) * 2013-03-27 2017-07-19 株式会社村田製作所 Wireless power supply device
JP2015008619A (en) * 2013-06-26 2015-01-15 キヤノン株式会社 Wireless power transmission and reception device
JP6230318B2 (en) * 2013-07-29 2017-11-15 キヤノン株式会社 Power receiving device, power receiving device control method, and program
JP6242311B2 (en) * 2013-10-29 2017-12-06 パナソニック株式会社 Wireless power transmission apparatus and wireless power transmission system
KR102233383B1 (en) * 2014-07-23 2021-03-29 삼성전자주식회사 Wireless power transfer system and method based on transfer schedule

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007020583A2 (en) * 2005-08-16 2007-02-22 Access Business Group International Llc Inductive power supply, remote device powered by inductive power supply and method for operating same
CN102918748A (en) * 2011-04-26 2013-02-06 松下电器产业株式会社 Wireless power transmission device
JP2013034367A (en) * 2011-06-30 2013-02-14 Semiconductor Energy Lab Co Ltd Non-contact power supply device
US20130062961A1 (en) * 2011-09-09 2013-03-14 Yongcheol PARK Wireless power system and resonant frequency changing method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017133238A1 (en) * 2016-02-01 2017-08-10 施京京 Method and circuit for wireless transmission of high-power electrical energy
JP2017200319A (en) * 2016-04-27 2017-11-02 清水建設株式会社 Wireless power transmission apparatus and wireless power transmission apparatus system
CN112640254A (en) * 2019-03-14 2021-04-09 欧姆龙株式会社 Wireless power transmission device and wireless power transmission system
CN112640254B (en) * 2019-03-14 2023-08-29 欧姆龙株式会社 Wireless power transmission device and wireless power transmission system
CN110244808A (en) * 2019-07-03 2019-09-17 西安易朴通讯技术有限公司 Voltage adjusting method, device, equipment and storage medium

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